1231303 has 2 divisors, whose sum is σ = 1231304. Its totient is φ = 1231302.

The previous prime is 1231301. The next prime is 1231309. The reversal of 1231303 is 3031321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231303 - 2¹ = 1231301 is a prime.

It is a super-2 number, since 2×1231303² = 3032214155618, which contains 22 as substring.

Together with 1231301, it forms a pair of twin primes.

1231303 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615651 + 615652.

It is an arithmetic number, because the mean of its divisors is an integer number (615652).

2^1231303 is an apocalyptic number.

1231303 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231303 is an equidigital number, since it uses as much as digits as its factorization.

1231303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 1231303 is about 1109.6409329148. The cubic root of 1231303 is about 107.1819479794.

Adding to 1231303 its reverse (3031321), we get a palindrome (4262624).

The spelling of 1231303 in words is "one million, two hundred thirty-one thousand, three hundred three".